Old perfume products

I used to like perfume (actually, rather than liking to wear it);;

I like collecting perfume bottles, lol.

I bought empty bottles for sale, and I also just bought perfume.

I even bought miniatures and stuff... lol

These days, I don't really wear perfume because it gives me a headache.

By any chance, what do you use old perfume for?

The scent has almost completely faded, but I still think it's better than a regular air freshener.

I spray it in my room, and I also spray it in the bathroom instead of air freshener...

If you know of any other places where I could use this, please recommend them.